1. This game was the first Midway
release to use the DCS Sound System.
2. SFII / MK2: both games were supposed to be released within weeks of
each other (at this time, SF and MK were the dominant fighting games).
Capcom released SSF2 early so that they could attract fans away from MK.
At the same time, Midway released MK2 early for similar reasons. As you
can see, the result meant that both came back to square one.

Updates

Version 1.1:

First version released to the public even though unfinished

Contained almost all moves but not many fatalities

Kintaro and Shao Kahn very difficult to beat

No ending stories

Baraka's blade swipe had no sound

Shang Tsung had the ceiling walk bug

Could beat Kintaro by just punching the entire match

Version 1.4:

Mileena's ground roll move added

Kung Lao's aerial kick added

Sub-Zero could do the first part of the freeze-uppercut fatality
during the match

Danger indicator added

Version 2.1:

First "official" release version

Intro text slightly changed

Reptile's slide added

Ending story and credits added

Computer intelligence improved

Nearly all fatalities were added

Friendships and babalities were added

The pit/spike fatality was added

Smoke and Jade were added

Kintaro and Shao Kahn easier to defeat

Could keep Kintaro and Shao Kahn up in the corner by using
repeated punches

Could crash the game through baby brutalization

Doing Shang Tsung's soul stealing fatality against Jax could
sometimes crash the game

Version 3.1:

More amounts of blood added

Dead Pool fatality added

Noob Saibot added

Raiden's super uppercut fatality added

Kung Lao's friendship added

Pictures of the creators added after the credits

Revolution X and DCS ads added

Comic and CD offer shows picture of CD

Computer intelligence increased

Computer has ability to do missile weapons in the air

Multiple babality problem fixed

Repeated punches in the corner against Kintaro fixed

Kitana's multiple fan lifts in the corner fixed

Sub-Zero freeze - punch - freeze - punch... fixed

Version 3.2 - European:

Nothing specific added yet

Hacked Revisions

Version 4.2:

Uppercuts are faster

Cage does red shadow kick and uppercut every time

Cages shadow kick goes twice as far

Barakas roundhouse has awesome range

Noob Saibot after only six wins

Pong after only 20 or so wins

Secret characters vulnerable to missile weapons

Liu Kang has a red dragon fatality

Kung Lao has a bones in his hat fatality

Version 9.1:

Play Pong after 12 wins

Play against Noob Saibot after 6 wins

Jax has a faster face smash

Faster Uppercuts

Johnny Cage has full time red shadow moves

And there is the multiple Dead Pool Fatality (normal upper cut
will knock the person in, then you can continue to hit them while
they're in the acid)

Version CHALLENGER:

More difficult fight ladder that often begins with Kintaro or a
hidden character

Dead Pool Fatality where you can punch the opponent out of the
acid and make them stick in the air

Johnny Cage has full time red shadow moves and all of the secret
characters can appear on the fight ladder